mastodon/app/javascript/packs/application.js

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import main from '../mastodon/main';
const needsBasePolyfills = !(
window.Intl &&
Object.assign &&
Number.isNaN &&
window.Symbol &&
Array.prototype.includes
);
const needsExtraPolyfills = !(
window.IntersectionObserver &&
window.requestIdleCallback
);
// Latest version of Firefox and Safari do not have IntersectionObserver.
// Edge does not have requestIdleCallback.
// This avoids shipping them all the polyfills.
if (needsBasePolyfills) {
Promise.all([
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import(/* webpackChunkName: "base_polyfills" */ '../mastodon/base_polyfills'),
import(/* webpackChunkName: "extra_polyfills" */ '../mastodon/extra_polyfills'),
]).then(main).catch(e => {
console.error(e); // eslint-disable-line no-console
});
} else if (needsExtraPolyfills) {
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import(/* webpackChunkName: "extra_polyfills" */ '../mastodon/extra_polyfills').then(main).catch(e => {
console.error(e); // eslint-disable-line no-console
});
} else {
main();
}